Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe49f15f9035c18…

MALICIOUS

PDF

32.3 KB Created: 2020-08-24 07:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99df602737556a16cf59f74944872e02 SHA-1: 681fec7554f1f81ed3fc72c8003a4372f17167e7 SHA-256: cbe49f15f9035c189e550f2b760b9af0c428e6ca52ddf380fe7e28744ba7c798
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many pointing to external PDF files hosted on various domains, indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, suggesting a potential phishing or malware distribution vector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=iron+gate+opening+sound+effect+free
    • http://files.k-9mechanics.com/uploads/1/3/1/3/131380029/lifujiwulubufe.pdf
    • http://files.lumenctr.org/uploads/1/3/0/9/130969190/895a2b6618e.pdf
    • http://tovepuzu.masdogs.com/uploads/1/3/1/0/131070450/babotijuzog-rulifinuroxa-fupifevamafa-verivejivozuwun.pdf
    • http://jasotibu.steveblanchardmusic.com/uploads/1/3/2/8/132814097/c905e700.pdf
    • http://kixuregax.sudhanashealingsolutions.com/uploads/1/3/0/7/130738969/sozipubijokejumu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/13396241753.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/62224784914.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/20951298175.pdf
    • https://cdn.shopify.com/s/files/1/0462/9174/6976/files/memifemidag.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/19971647665.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/20714232461.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/pudivaxejajuvuxilekev.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/dezudonurozigijaxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/vbspu_time_table_2020_pg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041c1.bin
56e09751b6367d544dfab1b8789b9902cd17af15131072eea2d6acd1a45e8fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41C1 5228 bytes
font_01_sfnt_off00005396.bin
e36ecd65078dc323c80436dd45266150f84c0e4681473e67a6a370605dc20fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5396 9672 bytes

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